[llvm] [DAG] select m, sub/add(X, C), X --> sub/add (X, and(C, m)) (PR #82441)
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Sat Feb 24 10:37:56 PST 2024
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@@ -11660,6 +11660,24 @@ SDValue DAGCombiner::visitSELECT(SDNode *N) {
}
}
+ // select m, sub(X, C), X --> sub (X, and(C, m))
+ if (N1.getOpcode() == ISD::SUB && N1.getOperand(0) == N2 && N1->hasOneUse() &&
+ DAG.isConstantIntBuildVectorOrConstantInt(N1.getOperand(1)) &&
+ N0.getScalarValueSizeInBits() == N1.getScalarValueSizeInBits()) {
----------------
goldsteinn wrote:
Shouldn't `sext` guarantee that?
https://github.com/llvm/llvm-project/pull/82441
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